Mold for propellers



June 30, 1925.

v 1,543,701 D. A. DICKEY MOLD FOR PROPELLERS Filed Feb. I5, 1919 .67 F'.7. F116: H19 7 ATTORNEY Tooll eb-liomit may ao'r'wem:

Pam-ta Jane 3011912 5. a

UNITED IIS' I ATES DANIEL Anni DICKEY, or wuxmsrvm, PEN SY VANIA, nssrenon' T0 wa menousn ELEcmm'c & momcruame oom mr, n: conrom'rronr or rm- SYLVAINIA.

11101.15 For, rnornm'ims m te-ma Eebrnary i5,19 19. e e. 277,244.

" Be it known that I, -DANIEL a-ci tizen'of the United States, aiida resident ofWilkinsburg, inthe county of Allegheny" and State of. Pennsylvania, have invented a;- new and useful Improvement in Mold-s. for

Propellers, of which the following is a- 'speci- .My invention relates to composite molded propellers and to a mold for curing propellers "of this character'and itlhasQfor one that propellers of various pitches may be" formed in the-sanie'mold.

. The primary object of my present invenobject, the provision of a moldso' constructed Heretofor'e, composite molded propellers have-'beeniormed-by superimposing prop j erlys'hapedlayers of fibrous sheet material, 'such as paper," duck' or the like',,' imprcg;

' mated with a suitable binder, suchas aphe 'nolic condensation product,-which may be hardened under the application ofheat and i pressurefto provide a propellerfshaped body.

The-bodyhas'then been disposed in a prop erly=shaped mold and there subjected ;to

heatand pressure to compao'tthe sheetqir w' ,terial and-to hardenthebindenf i 3 As different types of motors operate at different speeds and develop different quan- 1 jtitiesof power, itis essentiahgfcirthemost efiflcient operation of the'motors,-and of the. propellers which. they drive, that each pro-- peller be jiorme-d..with a, certainpredeterthat this pit'ch'be' varied according to the Thisnecessitates "the employment of a; large tion resides in constructing a mold of such character that propellers-of varying pitches nay b'e'formed' therein at. yvill;

Another' -object ofwmy inventionconsists' in providing a propeller of novel design such. asQvvillpe'rm-it i-ts being formed in amold of this character.

I I 'With these and-other objects in vievv; my

" ,"in-ventionwil-l be morejfullyQdescribd, illus- .trated in'the drawings, in the several views of which corresponding numerals indicate like, parts, and then particularly pointed outin the cl i "MFig. 1 is alplan-viewya part bein'g broken} away], of apropeller constructedinaccordance withmy invention; Fig. 2 is a side ele-f.-

A Di -e,

posed at'any v whi'chii's-best shown in Figs.:2.and4'to-9 inclusive. The mold comprises. an interrnediate or hub section t and terminal or blade I J a portions of my' mold indicatedin' dot and III of Fig." 1;'-"Fig'; 4 is a centra-l, longi tudinal, sectional flfvievv of the hub portion I of my mo1d, showing the members slightly r separated'g Fig"; 5 is'alside elevation of-onc of the blade'lportions-of the mold, also show- 65 1 Figssfi, 7,8 and 9 are transverse sections oif 3 the .mold taken atasubstant'ially. the'corre. 'spondinlgly numbered section lines of Fig. 2.1 1

f A propeller 1, constructed in accordance" 1 270 'tions-2 of the nsual shape and design anda 1 hub portion 3 ofthe-u sualbr any preferred shape and-design, .thesole difference 'betvveena the ropeller and the propellers as novv'com v f v ing the members slightly separated, and

with iny invention, may compriseblade porrnon y constructed be ng that the portions- .otthepropeller, near the hub and between.

It will be obvious ;tha','e ta as-aisle,

lines -Fig. 3 is a transverse, sectional I 'VleW of the propeller taken at the line IIL- Fit and non-active portions-of-the bladeyare;

formed of. circular crossfsection, fa's clearly 1. 1 "layersofifibrous sheet material,'impregnated with a binder,'-arestacked to form" a pro peller-shapedbody'in which, the lam-mamas run lengthwise of the-body and in' vvhich,the

portionslof the body adj acenjtthe' hub are of circular cross section, the blade portions of the assembled body may be reversely twisted,

tolanydesiredpitch, without bringing the blade portions out. of proper. alinement. and;

Without producing any ehangesin the shape of-'e1ther'--the -'hub p ortion; or the'blade'portions;

- .In 'order to provide'a means, for molding and .curing' propeller of .this character,

with the blade portions of the propeller dis:

desired pitch, I provide a mold sections 5 The hub section comprises upper- #andlower members 6 -and 'Z, the opposed. faces of -which are recessed in such'man n'er that, when the sections are closed, the pros "vide ahub shapedchamber, aswilll e ap'- parent from Figs. 2 and 4. If desired, these members maybe formed with alined open of a spindle-openingforming-mandrel 10.

priseupper and lower members Hand 12,

its. f

-- ings- 8 toreceivethe reduced terminals 9 the opposed faces of which are recessed to provide, when the members are in closed position, chambers shaped to properly form the blade portions of the prope ler.

I In practice, the terminal sections of the mold are disposed against-the ends of the hub section so that the several chambers aline and provide a single, continuous and uninterrupted propeller-receiving chamber 1 .of proper shape, the portions of the chamber I which are to mold the portions of the propeller which are of circular cross section being at the junctures of the terminal sections of the mold and the hub section thereof, as indicated in Fi 6.

In practisin my 1nvention,.a propeller body of suitable moldable material, such as superimposed layers of fibrous sheet material, impregnated with a phenolic conden 'sation product, may be assembled. ThJS may be done in any preferred manner as, for

" example, in the way disclosed in an application filed by me December 30, 1918, Serial No. 268,949, patented Feb. 13, 1923, No. 1,444,959, or in'the way disclosed in an application filed by Louis T. Frederick, December 30, 1918, Serial No. 268,954, patented Feb. 14, 1922, N 0. 1,406,365, assigned to the Westinghouse Electric & Manufacturing :10 Company.

The pro eller body thus assembled may be dispose between the roperly assembled members of the mold, as indicated in Fig. 2, and the mold, while bein heated in any suitable manner, may be c osed by a properly designed press to firmly compact the material and bring it to its desired shape and size and to, at the same time, transform the binder into its final hard condition. The moldmay then be cooled and removed from the press and the propeller may be taken from the mold.

Obviously, by reversely twistin I the terminal or blade-forming sections 0 the mold about" their longitudinal axes and interposing properly proportioned wedges between their upper and lower faces and the platens of the press, the terminal sections may be held in .adiusted position to cure blades of 5 any desired pitch.

It will, therefore, be clear that, b constructing propellers of the design in icated and by the employment of a mold of the character descr1bed,.i t is possible, with a ing chamber of whic single mold, toform propellers having any desired pitch.

Although I have described my ropeller and its mold in considerable detail it will be obvious that various changes in 'both may be made and, for this reason, no limitations are to be imposed upon my invention other than those indicated in the appended claims.v r

I claim as my invention:

' 1. A mold for arable blade-forming sections and a hubforming section, each comprising co-operating members having their opposed faces recessed whereby, when the members engage each other and the sections are assembled in alinement, they co-operate to provide a propeller-shaped chamber, the portions of the chamber adjacent the ends of the hubforming section and the inner ends of the blade-forming sections being of substantially circular cross. section.

2. A mold comprising a hub-forming section and blade-formin sections capable of being reversely turned about their longitudinal axes relative to the hub-forming section, whereby blades of various pitches may be molded.

3. A mold for propellers comprising a. hub-forming section and blade-forming sections, each comprising co-operating mem bers and all adapted, when properly assembled, to rovide a propeller-shaped molding cham r of whic portions at the meeting points of the sections are substantially circular in cross section.

4.'A- mold for propellers comprising a hub-forming section and blade-forming sec tions, each comprising co-operating members and all adapted, when properly assembled, to provide a propeller-shaped moldportions at the meet ing points of the tially circular cross section, the blade-forming sections being ada ted tobe reversely turned about their longitudinal axes, whereby material positioned in the mold, to be formed into a propeller, may be twisted so that its blade portions any desired pitch.

subscribed my name this 28th (1 of J an., 1919. i

DANIEL ADAM DICKEY.

propellers comprising sep may be molded at In testimony whereof, I have hereunto sections are of substan- 

